[Haskell-beginners] Using FiniteMap in ghci

Hello, I tried to load FiniteMap module in ghci and encountered an error message like the following: Prelude> import FiniteMap Could not find module `FiniteMap': it is a member of package ghc-6.8.2, which is hidden The error message says that it is hidden. How can I use the FiniteMap? Regards, Kwang Yul Seo